Boiler



Nov. 20, 1928.

F. B. HOWELL BOILER Original Filed Oct. 23, 1914 4 Sheets-Sheet 1 Swwentoz Nov. 20, 1928. 1,692,122

' F. B. HOWELL BOILER Original Filed Oct. 23, 1914 4 sh t -s t 2 n n m I m u n I u m m "2 I n, a I n u n n m m I iillhlHuH 7% iiitw/ i aanfi fi 3 a. p. in.

F. B. HOWELL Nov. 20, 1928.

BOILER Original Filed Oct. 23, 1914 4 Sheets-Sheet 4 avwemtoz (5M6 M 6% w m-fm Patented Nov. 2c, 1928.

rnnnn "an STATES B. HOWELL, or BUFFALO, NEW YORK, sssrenon ro AMERICAN RADIATOR PATENT" oFFicooiarAnY, or CHICAGO, ILLINOIS, A oonronnrion'or' NEW JERSEY.

" BOILER.

Original application filed'Oct'bber 23, I914, serial l lo. 4503672. Renewed Divided and this applicationfiled September 10, 1921.- Serial No. 499,664.

My invention relates-to improvements in "boilers, and the same has for its object more particularly adapted to burn bituminous or other soft fuel economically and smokelesslyp Further, said invention has for its object-'.

to provide a boiler having a secondary "air supply which is so constructed and arranged that the exact volume of air necessary to in sure complete combustion may be supplled Further, said invention has for its object to provide the boiler with means for supplying secondary air which is so constructed and arranged that a part thereof w ll be ex osed directly to the radiant heat of. the fue and to the hot gases issuing therefrom, and 'another part thereof be protected: by waterbacked portions of the boiler. H

Further, said invention has for its object to provide the boiler with means for supplysecondary air which is so constructed" and arranged that thesame'may be readily adjusted from Without the boiler'in order't'o regulate and control the volume of air admitted to the combustionchamber.

Further, said invention has for its object to provide means for supplying' secondary air to the combustionchamber' which is so constructed and" arranged that the same may be readily withdrawn from the'boiler and another member- -inserted in place thereof when the said air supply member becomes worn or unfit for further use.

Qther objects will in part be obvious and in part be pointed out hereinafter.

To the attainment of the aforesaid objects and ends my invention consists in thenovel details of construction, and in the combine} tion, connection and arrangement of parts hereinafter more fully describedandthen pointedout in the claims.

In the accompanying drawings whereinlike numerals of reference indicate like parts' I Figure I is'a" front elevation showing one form of boiler embodying mysaid invention;

to provide aboiler which is:

Fig. 2. is a side elevation viewed from the left hand side'in Fig. '1; n

Fig. 3 is a verticalsection, on an-enlarged: scale, through one of the fines or draftpassages and the fuel receptacle online 33, Fig. 4;.

March 8; 1921, serial No. 450.6721" i Fig. 4 1s a fragmentary horizontal section? on line 4'4, Fig. 3;

Fig. 5 is a vertical section transverse to the flues on line 5.-5, Fig. 3; I 3

Fig. 6 is a detail'horiz'ontal section showing a modified form of air duct v I Fig. 7 is a fragmentary end elevationsho-w-u ing means for actuating the secondary air tube; V I

Fig. 8 is a fragmentary vertical section of the secondary air tubeand the related parts;

Fig. 9 is a fragmentary. horizontal section showing another modified construction'of secondary air supply devices; and

Fig. 10 is an end elevation, partly in section, of the construction illustrated at Fig. 9-;

In said drawings, the boiler is'i'epresented as comprising end sect-ions 20;.21,.narrow in termediat'e front sections 22-, anddeeper intermediat'e rear sections 23 wlric'h are-so ar-r ranged in spaced relation tosaid front scctions as to form a fuel receptacle 24 extendmg from one end section to the other.

' The endsections 20, 21, and the interine" diate front and rearsections 22, 23 are pros vided upon their opposite sides with laterallyextending peripheral ribs 26 which are adapted toengage with the corresponding ribs of? the adjacent sections and form fines 27 intermediate said sections; The upper and lowerrportions of theend and front intermediate sections; as Well as the ends andnthe upper and lower portions-of the rear intermediate sections 23 are pro vided with registering openings to receive nipples 29, 29 and-34; 35, respectively; whereby communication may be established 1 between the several sections of the 'boi ler.

The front. intermediate sections22'are provided at their opposite edges adjacentto'the lower portions with inwardly inclined laterally extending ribs 28 which rgister'with the I corresponding ribs ofthe adjoining sections to form openings 28 for 'admitting the" main supply-of air to the fuel receptacle 241 its ends.

. tacle. The hot gases and products of combusa large opening 32 communicating at one or the other of its ends with a smoke outlet 33.

Each intermediate rear section 23 is provided with an'aperture 34 which is located at the front edge below the peripheral rib 26, at a point approximately at the height or level where the combustion of the fuel. occurs -within the fuel receptacle, and each of said apertures 34 is provided at its opposite ends with a peripheral collar or rib 34.

A secondary air supply member 35 is disposedwithin the apertures34 and extends transversely through the boiler for thepurpose of furnishing an additional or secondary supply of heated air to the products of combustion issuing from the fuel receptacle.

The air supply member or tube 35 is preferably cylindrical and is revolubly mounted within the nipples 36 located in the apertures 34 of the sections. The said air supply member 35 may be open at one orboth ends for the admission of air, and is provided with segmental slots 37 or other suitable openings adapted to register with correspondingslots or air outlets in the collars 34 and nipples 36 through which the air may issue into the fines arranged to the rear of the fuel receptacle 1 and extending therefrom to the smoke outlet 33. The admission of secondary air to tube may be regulated by any suitable means, as, for example, by pivoted dampers 38 arranged upon the outer side of the boiler at each of The main supply of air for supporting combustion enters at the front of the fuel receptacle through the passages 28"between the front ribs 28, and passes transversely through the column of fuel into the reception pass rearwardly between the ribs 30 of the rear intermediate sections and then pass upwardly over the upper portion of the rib 31 and rearwardly and downwardly through the openings 32 to the smoke outlet 33.

The front openings may be covered by doors 30 provided with suitable air inlet openings 40 controlled by sliding dampers 41.

In the construction represented in Fig. 6,

the front air inlets of the fuel receptacle are covered by a chamber which is open at the top, where a damper 46 (Fig. 10) is located.

- The chamber 45 may be connected by a pasprimary passages The supply and return pipes leading to and.

from the boiler maybe arranged in any desired manner. In the drawings 47 represents the return pipe and 4% the supply pipe.

47 denotes the fuelreceptacle cover, 48

the ash pit, and 49 the door therefor.

In the-secondary air inlet supply construetion represented in Figs. 7, 8 and 9, the con-, necting nipples are omitted and the tube 50 is rotatably arranged within the flanged opens ings 51 of the rearsections. The faces" of: these flanges are partly recessed to form segmental slots 52 which correspond with'the segmental slots 53 of the tube. The slots 53 may be of such length that the same can be wholly or partially closed, as desired, by rotating the tube. Suitable means'are provided for rotating the tube, for instance, a hand lever 54 securedv to one end of the tube, and the most desirable positions of, the tube to supply the'specific volume of air required for the particular fuel used are preferably indicated on the side of the boiler, as represented in Fig. 7. A hinged cover 55 or other suitable closure is provided on the side of the boiler for closing the end of the tube, 1f des1red.

In the modified construction represented in Figs. 9 and 10, the stem 60 of the hand lever 61 extends through the air chamber62 leading to the tube and the positions of the tube may be indicated directly on this chamber.

A boiler equipped with my. invention is capable of burning all kinds of fuel economically and smokelessly, particularly soft or bituminous coal, without requiring frequent at Inn.

tention and without necessitating the frequent cleaning of the. lines and heating surfaces. The smokeless combustion'of soft or. bituminous coal and similar fuel 1s insured by the additional supply of air which is admitted in a highly heated state to the flame and hot gases at the point where they issue from the body of burning fuel in the fuel receptacle. The secondary air supply ishighly heated in passing through the tubular air passage which lies in rear of the hottest part of the burning body of fuel, and by this means is caused to mingle with the combustible gases liberated by the fuel without cooling or reducing the temperature thereof.

This application is a division of my prior application originally filed October 23, 1914, and renewed March 8, 1921, 'Serial No. 4

1,393,622 were granted October 11,1921.

Having thus described my said invention what I claim and desire to secure byLetters Patent is:

1. A boiler of the character described com prising a fuel receptable including a trans-' verse wall member having .a secondary air passage therein at the lower extremity thereof, and flues to the rear of said wall member communicating with said fuel receptacle below said. transverse wall member and said secondary air passage; said wall member including a series of separated water-backed portions arranged in spaced relation to each other along said secondary air passage and ex tending below the same, and a series of air outlets intermediate said water-backed portions below said secondary air passage communicating with said secondary air passage for directing the secondary air downwardly between said water-backed portions adjacent the rear of the fuel mass in a series of jets transversely of the boiler, substantially as specified. I

2. A boiler of the character described comprising a fuel receptacle including a transverse wall member at the upper rear part thereof, fines to the rear of said wall member communicating with said fuel receptacle below said transverse wall member, and a separate member forming with a cooperating part of said wall member a transversely ex tending secondary air duct at the lower extremity of said wall member; said cooperating part including a series of separated waterbacked portions arranged in spaced relation to each other along said secondary air duct and extending below said separate member, and a series of air outlets arranged intermediate said water-backed portions and communicating with said secondary air ductfor.

directing the secondary air downwardly between said water-backed portions adjacent to the incandescent fuel mass to mix with the products of'combustion as the same enter said flues, substantially as specified.

3. A boiler of the character described comprising a fuel receptacle including a transverse wall member at the rear thereof, flues extending rearwardly therefrom and communicating with said fuel chamber below said wall member, and a separate member carried by the lower portion of said wall member to providea secondary air passage; said wall member including a series of separated waterbacked portions arranged in spaced relation to each other along and extendin below said separate member for supporting t e same, and outlets in said wall member arranged intermediate said water-backed portions below said separate member and communicating with said secondary air passage for directing the secondary air therefrom downwardly to the products of combustion passing towards spaced relation to each other along and extending below said separate member for supporting the same, and a series of outlets in said cooperating part arrangedintermediate said water-backed portions below said secondary air passage andcommunicating with said secondary air passage for directing the secondary air downwardly to the products of combustion passing towards said flues said transverse secondary air passage having a portion thereof exposed directly to the incandescent fuel and the products of combustion, and other parts thereof in Contact with watervbacked surfaces of said boiler, substantially as specified.

5. In a sectional boiler, the combination with upright front sections and rear sectionsforming between them a fuel chamber, said rear sections being separated by flues extending from the lower portion of said chamber, of an air inlet passage extending across said rear sections: and said fines and comprising collars, formed on the sides of said rear sections, and an air supply tube arranged within said collars, substantially as specified.

6. In a sectional boiler, the combination with upright front sections and rear sections I forming between them a fuel chamber, said rear sections being separated by fiues'extending from the lower portion of said chamber,

of an air inlet passage extending across said rear sections and said fines and comprising collars formed on the sides of said rear sections, and an air supply tube rotatably arranged within said collars, substantially as specified. 7

Signed at the city of Buffalo, Erie County,

in the State of New York, this 8th day of September, one thousand nine hundred and twenty-one. FRANK B. HOWELL. 

